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arXiv 1507.05940cond-mat.soft
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近晶C* 液晶中刃位错的纳米结构

Nanostructure of edge dislocations in a smectic C* liquid crystal

C. Zhang, A. M. Grubb, A. J. Seed, P. Sampson, A. Jákli, O. D. Lavrentovich

摘要:

我们报告了在热致手性近晶C液晶中的基本刃位错的第一个直接纳米级成像,其中Burgers矢量等于一个近晶层间距d。我们发现两种不同类型的位错分布。在A型位错中,层变形相对于垂直于Burgers矢量的平面缺乏镜像对称性;位错核心尺寸为d的数量级。在S型位错中,核心是强各向异性的,沿着Burgers矢量延伸的距离比d大得多(4倍)。这种差异归因于分子倾斜面相对于位错轴的不同取向;当分子倾斜面垂直于位错轴时观察到不对称层扭曲,当分子沿着位错轴倾斜时观察到分裂的S核。

英文摘要:

We report on the first direct nanoscale imaging of elementary edge dislocations in a thermotropic chiral smectic C liquid crystal with the Burgers vector equal to one smectic layer spacing d. We find two different types of dislocation profiles. In the dislocation of type A, the layers deformations lack mirror symmetry with respect to the plane perpendicular to the Burgers vector; the dislocation core size is on the order of d. In the dislocation of type S, the core is strongly anisotropic, extending along the Burgers vector over distances much larger (by a factor of 4) than d. The difference is attributed to a different orientation of the molecular tilt plane with respect to the dislocation axis; the asymmetric layers distortions are observed when the molecular tilt plane is perpendicular to the axis and the split S core is observed when the molecules are tilted along the line.

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